org.objectweb.medor.expression.lib
Class Concat

java.lang.Object
  extended byorg.objectweb.medor.expression.lib.BasicOperator
      extended byorg.objectweb.medor.expression.lib.BasicBinaryOperator
          extended byorg.objectweb.medor.expression.lib.Concat
All Implemented Interfaces:
BinaryOperator, java.lang.Cloneable, Expression, Operator, java.io.Serializable

public class Concat
extends BasicBinaryOperator
implements BinaryOperator

See Also:
Serialized Form

Field Summary
 
Fields inherited from class org.objectweb.medor.expression.lib.BasicBinaryOperator
left, right
 
Fields inherited from class org.objectweb.medor.expression.lib.BasicOperator
expressions, result, type, verified
 
Fields inherited from interface org.objectweb.medor.expression.api.Operator
ABS, AND, AVG, BITWIZE, CONCAT, CONDAND, CONDOR, COUNT, DIV, EQUAL, FIRSTLOCATE, GREATER, GREATEREQUAL, IN, INDEXEDLOCATE, LENGTH, LOWER, LOWEREQUAL, MAX, MEMBEROF, MIN, MINUS, MOD, MULT, NAV, NOT, NOTEQUAL, NOTMEMBEROF, OR, PLUS, SQRT, SUBSTRING, SUM, UMINUS
 
Constructor Summary
Concat()
           
Concat(Expression left, Expression right)
          Returns the concatenation of two strings.
 
Method Summary
 Operand compileExpression()
          Checks the semantic integrity of an expression.
 Operand evaluate(ParameterOperand[] pos, java.lang.Object o)
          It evaluates the expression tree and puts the result into the operand result.
 java.lang.String evaluate(java.lang.String op1, java.lang.String op2)
           
 java.lang.String getOperatorString()
          Returns the String representing the operator in Java
 
Methods inherited from class org.objectweb.medor.expression.lib.BasicBinaryOperator
getExpression, getLeftExpression, getOperandNumber, getRightExpression, setExpression, setLeftExpression, setRightExpression
 
Methods inherited from class org.objectweb.medor.expression.lib.BasicOperator
getType
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface org.objectweb.medor.expression.api.BinaryOperator
getLeftExpression, getRightExpression, setLeftExpression, setRightExpression
 
Methods inherited from interface org.objectweb.medor.expression.api.Operator
getExpression, getOperandNumber, setExpression
 
Methods inherited from interface org.objectweb.medor.expression.api.Expression
getType
 

Constructor Detail

Concat

public Concat(Expression left,
              Expression right)
Returns the concatenation of two strings.

Parameters:
left - the first Expression to be concatenated
right - the second Expression to be concatenated

Concat

public Concat()
Method Detail

evaluate

public Operand evaluate(ParameterOperand[] pos,
                        java.lang.Object o)
                 throws ExpressionException
Description copied from interface: Expression
It evaluates the expression tree and puts the result into the operand result.

Specified by:
evaluate in interface Expression
Parameters:
pos - a list of ParameterOperand
o - the input Object from which values are taken for the evaluation
Returns:
an Operand containing the result of the evaluation
Throws:
ExpressionException

evaluate

public java.lang.String evaluate(java.lang.String op1,
                                 java.lang.String op2)

compileExpression

public Operand compileExpression()
                          throws ExpressionException,
                                 MalformedExpressionException
Description copied from interface: Expression
Checks the semantic integrity of an expression. It checks that all types are compatible and prepare the expression to be evaluable.It also creates buffers where stores the result. Notes that when evaluating there is no creation of new objects. This method change the state of this expression object, it will be evaluable and not modifiable.

Specified by:
compileExpression in interface Expression
Throws:
MalformedExpressionException - if syntax error
ExpressionException

getOperatorString

public java.lang.String getOperatorString()
Description copied from interface: Operator
Returns the String representing the operator in Java

Specified by:
getOperatorString in interface Operator
Returns:
the String representing the operator in Java